This function converts a Blob into a File and it works great for me.
Vanilla JavaScript
function blobToFile(theBlob, fileName){
//A Blob() is almost a File() - it's just missing the two properties below which we will add
theBlob.lastModifiedDate = new Date();
theBlob.name = fileName;
return theBlob;
}
TypeScript (with proper typings)
public blobToFile = (theBlob: Blob, fileName:string): File => {
var b: any = theBlob;
//A Blob() is almost a File() - it's just missing the two properties below which we will add
b.lastModifiedDate = new Date();
b.name = fileName;
//Cast to a File() type
return <File>theBlob;
}
Usage
var myBlob = new Blob();
//do stuff here to give the blob some data...
var myFile = blobToFile(myBlob, "my-image.png");